refactor: improve readability of template logic in document_html.html

Author: jennifer-richards

ietf/templates/doc/document_html.html

@@ -9,7 +9,11 @@
           title="Document changes"
           href="/feed/document-changes/{{ doc.name }}/">
     <meta name="description"
-          content="{{ doc.title }} {% if doc.get_state_slug == "rfc" %}(RFC {{ rfc_number }}{% if published %}, {{ published.time|date:"F Y" }}{% endif %}{% if obsoleted_by %}; obsoleted by {{ obsoleted_by|join:", " }}{% endif %}){% else %}(Internet-Draft, {{ doc.time|date:"Y" }}){% endif %}">
+          {% if doc.get_state_slug == "rfc" %}
+              content="{{ doc.title }} (RFC {{ rfc_number }}{% if published %}, {{ published.time|date:"F Y" }}{% endif %}{% if obsoleted_by %}; obsoleted by {{ obsoleted_by|join:", " }}{% endif %})"
+          {% else %}
+              content="{{ doc.title }} (Internet-Draft, {{ doc.time|date:"Y" }})"
+          {% endif %}>
 {% endblock %}
 {% block morecss %}
     .bgwhite  { background-color: white; }